I once saw a dollar on the ground in a crowded hallway. It was pretty narrow and busy, people sitting waiting for class lined the walls as well. Being the socially anxious/SAP I am, I didn't want to bend down and pick it so I walked by it. Right after I did, I heard some girl say something to the effect of who walks by money on the ground. This girl was sitting directly in front of said money. It was either an experiment or she was an idiot.

It is a new source of energy. First, you must perform a summoning ritual and get your engine possessed by a demonic spirit. Second, get a priest to piss that demonic spirit off which will make it thrash about with the power of 100 to 500 horses (dependent on your demonic spirit of course). Viola. SCIENCE.